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Southwest Highlands

Confidence

High for mainly dry and settled conditions on Wednesday and Thursday. Medium for details on Tuesday and Friday and Low on Saturday.

  • Tuesday
  • Wednesday
  • Further outlook

Tuesday 16 October 2018

Weather hazards

Gales High likelihood Hide detail

Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

Poor visibility High likelihood Show detail

Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Storm force winds Low likelihood Show detail

Storm force winds (gusts over 70mph) make walking very strenuous with any mobility virtually impossible over exposed ground. Where these conditions occur there is a high risk of being blown over and even standing may be impossible at times with a risk of being blown off one’s feet. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.

Severe chill effect Low likelihood Show detail

Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Headline

Mostly cloudy with occasional rain and drizzle. Gales over the tops and feeling cold.

Weather at 800m

06:00 09:00 12:00 15:00 18:00 21:00
Fog Heavy rain Heavy rain Drizzle Cloudy Light shower night
20% 40% 70% 50% 30% 30%
Chance of precipitation
1,300 2,800 2,600 1,800 1,600 1,700
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m SE 50 60 S 57 70 S 42 54 SW 39 50 SW 38 50 SW 41 53
900m SE 31 39 S 40 52 S 33 44 SW 30 40 SW 31 42 SW 33 45
600m S 46 54 S 53 64 S 34 43 SW 29 39 SW 30 39 SW 32 42
300m S 22 34 S 27 39 S 17 28 SW 15 29 S 15 28 SW 16 31
Glen S 8 22 S 18 38 S 10 25 SW 11 29 SW 9 27 SW 11 31

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m 1 1 3 4 3 3
900m 3 4 6 6 5 6
600m 6 9 8 8 8 8
300m 8 10 10 10 10 10
Glen 9 12 11 12 12 12

Feels like temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
1300m -9 -8 -4 -4 -5 -5
900m -4 -3 -1 0 -1 -1
600m 0 3 3 3 3 3
300m 4 5 6 7 7 7
Glen 7 8 9 10 10 10
Sunrise: 07:52   Sunset: 18:16
Moon phase: First quarter

Weather

Low cloud at first, most persistent across the Trossachs. This clears, turning brighter for a time. However rain and low cloud spread into Mull by mid-morning, then to all ranges by around midday. Turning drier and brighter in the afternoon, but a few showers in the evening, mainly near the west coast.

Chance of cloud-free mountain/hill tops at 800m

20% at first, extensive cloud with bases 600m or less, but more broken over Lochaber. Becoming 70% for a time as cloud lifts around late morning. Falling to 10% by the afternoon, cloud bases typically 500 to 700m. Becoming 70% during the evening as the cloud begins to lift and break.

Visibility

Poor for much of the day, but improving to good for a few hours around mid-morning. Becoming mostly good in the evening.

Met Office Aberdeen meteorologist's view

Feeling cold over the tops with a significant wind chill. Winds generally around 10 mph lighter across Loch Lomond and the Trossachs.

Wednesday 17 October 2018

Sunrise: 07:55   Sunset: 18:14
Moon phase: First quarter

Weather

Rather cloudy in the early hours with a few showers, wintry over the tops. Mainly dry by dawn then a bright day with occasional sunny spells, and a few well scattered showers, wintry over the tops. Dry with well broken cloud in the evening and temperatures quickly falling.

Maximum wind speed expected

West 20 to 25mph gusts 35mph, but gusts 50mph during the early hours. Winds easing later in the day.

Chance of cloud-free mountain/hill tops at 800m

Typically 70%, occasional or patchy cloud with base 900m or higher, but 30 to 50% during the early hours, more extensive cloud with bases around 600m.

Temperature

  • At 800m Plus 2 to 4 Celsius, but around freezing by the end of the day.
  • Glen Plus 4 Celsius rising to 11 Celsius
  • Freezing level Around 1100m, becoming 900m late in the evening.

Visibility

Mostly very good or excellent, but moderate or poor in any showers.

Thursday 18 October 2018

Sunrise: 07:57   Sunset: 18:11
Moon phase: First quarter

A dry day with some bright spells, cloud increasing later in the day. Light southwest winds becoming strong later. Freezing level around 1200-1300m.

Friday 19 October 2018

Sunrise: 07:59   Sunset: 18:09
Moon phase: First quarter

Mostly cloudy with patchy rain, drizzle and hill fog. This turning more persistent for a time. Southwesterly winds increasing strong to gale force over the tops and the freezing level rising above the summits.

Saturday 20 October 2018

Sunrise: 08:01   Sunset: 18:06
Moon phase: Waxing gibbous

Rather dull and cloudy, patchy rain and drizzle at times. Gale or severe gale force west or southwest winds over the tops. Freezing level above the summits.

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